howtogeek at May 6th, 2014 12:34 — #1
Originally published at: http://www.howtogeek.com/188414/protect-your-data-in-the-cloud-with-truecrypt/
With news of the NSA, GCHQ, big corporations, and anyone else with an Internet connection snooping through your online data these days, you can’t be too careful when it comes to protecting the stuff you put in the cloud. This guide will tell you what you need to do so that TrueCrypt can keep your synced files guarded from prying eyes.
readandshare at May 6th, 2014 13:19 — #2
One question about using TC and uploading changed files to cloud: My 'Documents' folder consists of 50 files, which I wish to store encrypted in the cloud. Will a change in one file necessitate re-uploading of the entire batch of files as 'one big file' each time?
wilsontp at May 6th, 2014 13:47 — #3
Yes - mostly.
Since TrueCrypt is a container, changing the data in the container means you must synchronize the entire container to make the data available somewhere else.
However, different cloud services may copy files at the file level or at the block level. Services that copy files at the block level will only upload the changed portions of the file to the cloud. Services that copy at the file level would have to re-upload the entire container when its contents are changed.
According to one block post I found, Dropbox synchronizes at the block level. So if you only change 2KB of data in your encrypted container, only 2KB of data gets transferred to synchronize other copies of the file.
However... there's a catch. Encryption is a special case. Encryption algorithms usually spread their effects across large blocks of data in order to make it harder to decrypt the file without the key. So the smallest block that can be transferred is whatever TrueCrypt's block size is.
frugalben1 at May 7th, 2014 16:32 — #4
TrueCrypt (TC) can indeed be an excellent way to protect data destined for cloud storage and this post gives several good hints about doing it. That said, before you trust your important TrueCrypt file to any cloud service, you should run realistic tests of whether or not the TrueCrypt file and the service you choose will play together nicely.
For example, I have been using a small (250 MB) TC file with Dropbox for many years. Never had a problem. When I tried to use a much larger TC file (5 GB) with other cloud services, the TC file became totally corrupted after two or three syncs. This also happened with I tried it with BitTorrentSync.
So, consider yourself warned. If your data is important to you, make sure you extensively test the compatibility of TC with the service you are using before trusting the service to handle the job without data corruption.
I posted a longer version of my tests at "http://www.thriftslut.blogspot.com/2014/01/cloud-services-like-bittorrentsync-do.html". As you will see there, the way a particular cloud service handles TC files can be very unpredictable.
Hope this helps.
jeorge_kabbi at May 8th, 2014 01:17 — #5
good for you mate. you nailed it.
icheyne at May 9th, 2014 15:09 — #6
This makes Truecrypt and cloud storage like Dropbox only usable for storing a small number of important files that are rarely changed.
jacob_zinicola at May 14th, 2014 16:33 — #7
The strongest security measures generally come with a certain usability trade-off. You'll need to judge for yourself what's worth going through the trouble of protecting, and what's not. A massive photo album that's mostly available on Facebook anyway probably doesn't really need to be encrypted. Copies of tax forms or other documents containing Personally Identifiable Information (PII) and financial or medical records, on the other hand, probably should be.
system at May 16th, 2014 12:34 — #8
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